Reversible door operator switch



F. A. PU RDY May 13, 1969 REVERSIBLE DOOR OPERATOR SWITCH Sheet FiledOct. 2, 1964 y 13, 1969 F. A. PURDY REVERSIBLE DOOR OPERATOR SWITCHSheet 2 of 7 Filed Oct. 2, 1964 May 13, 1969 F. A. PURDY REVERSIBLE DOOROPERATOR SWITCH Sheet Filed Oct. 2, 1964 May 1-3, 1969 F. A. PURDYREVERSIBLE DOOR OPERATOR SWITCH Sheet 4 of 7 Filed Oct. 2, 1964 May 13,1969 I PURDY 3,444,344

REVERSIBLE DOOR OPERATOR SWITCH Filed Oct. 2, 1964 1 1? "i T 25 L mfll$y 1969 F. A. PURDY 3,444,344

REVERSIBLE DOOR OPERATOR SWITCH Filed Oct. 2, 1964 Sheet Q of 7 May 13,1969 F. A. PURDY REVERSIBLE DOOR OPERATOR SWITCH Sheet Filed Oct. 2,1964 United States Patent 3,444,344 REVERSIBLE DOOR OPERATOR SWITCHFrederick A. Purdy, 521 Park Ave., New York, N.Y. 10021Continuation-impart of application Ser. No. 226,411, Sept. 26, 1962.This application Oct. 2, 1964, Ser.

Int. Cl. H01h 3/00 US. Cl. 200153 Claims ABSTRACT OF THE DISCLOSURE Amotor operated door having a reversible motor for opening and closing adoor, and a circuit for controlling the motor, a switch in the circuithaving a tongue of pliable material having an inherently fixed shapeinto which such tongue returns when freed after bending, electrodeswithin the circuit extending through the tongue for making electricalcontacts in alternating directions, means for bending the tongue, meansfor holding the tongue bent and means for releasing the holding means.

Patent Serial Identification Number Date of issue Number Date of filingA". 2, 758, 836 Aug 14, 1956 290, 859 May 31, 1952 B 2, 876,002 Mar 3,1959 526,035 Aug. 2, 1955 C. 3, 048, 761 Aug 7, 1962 687, 509 Oct. 1,1957 D 3, 060,361 Oct 23 1962 84, 848 Jan. 25, 1961 3, 147, 001 669, 143July 1, 1957 104, 769 Mar. 3,1961

202,817 June 15,1962

226, 411 Sept. 26,1962

ObJBClIS of invention An object of this invention is to provide a switchfor opening and closing the circuit of electric current to thedoor-drive motor, which not only provides the path for current toenergize the door-drive motor, but draws upon current in a polarity todrive the door in one direction to close, and in a polarity to drive thedoor in the opposite direction to open; also to provide a switch, havingpath and polarity functions combined in one device, which has, undergiven conditions, an inherent bias toward the needed polarity, and underopposite conditions an inherent bias toward the opposite polarity.

As may be observed in all of my patents and applications, as abovelisted, the switch to supply motive power to the door-drive motor hasbeen separate from, not embodied within, the reversing switch thatelects the polarity of the current to determine the direction ofrotation of the motor.

A further object is to provide such a switching-device, its bias heldpositively until releaseed, with a releasing means susceptible ofresponding to a relatively gentile impulse applied by a timing-actuatorsuch as shown in patent listed as C. Patent C shows an actuator of twochambers, one here called a pivotal chamber, and one a hammer-chamber.Within is a flowable material movable by gravity from chamber tochamber. This is a timer and actuator of great simplicity andpracticability. The

ice

preponderance in force of inertia at the hammer-chamber when chargedwith flowable material, does not greatly exceed the force of inertia ofthe empty shell of the hammer-chamber. An object of this invention is togain reliable advantages for such preponderance, and to do it in simpleways, at lower cost.

Another object is a simpler design of actuator construction.

Another object of the invention is to obtain a dependable flow bygravity of flowable material within the actuator, and to gain a longertime-period, and a more precise control of the period, for the flow by agiven quantity of the material.

A related object is to avoid sluggishness, in the flow, that arises withwater-vapor in the atmosphere, which may affect the flowable material byoxidation or otherwise.

An a further object is to gain the fullest practical advantage of weightin relation to volume in the flowable material, to afford optimum forceof inertia under movement.

Another object of the invention is a simple design of shipper-buttonwhich holds with extensive surface-friction upon a cable used fortransmitting the drive from motor to door. A button that is limited tosurface-friction by the end-tips of set-screws does not have acomparable hold.

Another object is to guard against dust unduly entering a cabinet.

Another object. of the invention is to maintain in the jointed-linkagethat runs in the track, a continuing bias towards the vertical web-sideof the track, to correct more fully than shown in my patent applicationH, any tendency by the jointed linkage to escape from a track that isprovided with a lateral flange for the roller-groove but no flangevertically at the upper enclosure on the open side of the track.

Another object is to provide a low cost arrangement for breaking thecircuit that includes a cell at doorway-frame and a relay that providesfor energizing a solenoid to effect motor-operation of the door; also alow-cost timing means for reclosing the cellto-relay circuit after theexpiration of a period of time; ensuring that within the time-period noactuation of the door could occur to bring the door down upon a carpassing into the garage; or could occur to reopen a closed door while acar, having left the garage, was being maneuvered in the driveway for acourse to 'be taken in leaving the garage.

These and minor objects will appear in the development of thedescription.

The accompanying drawings show, for purposes of illustration,embodiments in which the invention may take form, but the invention isnot limited to these embodiments.

FIGURE 1 is a diagrammatic face view of door-guide tracks at one side ofgarage, of door-operator devices in realtive positions, and awiring-diagram.

FIGURE 2 is a face view of devices within a cabinet.

FIGURE 3 is a side view of FIGURE 2.

FIGURE 4 is a plan view of FIGURE 2.

FIGURE 5 is a face view of an actuator in two operating positions.

FIGURE 6 is a sectional view of actuator tube and web therein, of lines6-6 of FIGURE 5.

FIGURE 7 is a view of reversing switch on lines 77 of FIGURE 2.

FIGURE 8 is a section on lines 8-8 of FIGURE 7.

FIGURE 9 is a diagrammatic view of a cable slanting from sheave todetaching-lug.

FIGURE 10 is an outline of a sheet-metal blank for a linkage-unit beforeforming into channel-shape.

FIGURE 11 is an outline of a sheet-metal blank prior to forming into adoor-attaching link.

FIGURE 12 is an end-view of the formed link of FIG- URE 11 and ofrelated parts.

FIGURE 13 is a face view of motor-drive and shiftmechanism above thecabinet of FIGURE 2 at rear end of track of FIGURE 1.

FIGURE 14 is a side view of FIGURE 13 with parts omitted for clarity.

FIGURE 15 is a side view of an auxiliary drive.

FIGURE 16 is a side-view of a shipper button.

FIGURE 17 is a side-view of a slanted pulley.

Electrical elements Although any electric current may be adopted, if thedevices are rated for it, the supply of electric current used is 110volts alternating current, 60 cycles, generally known as house-current,and for this several of the electrical devices are rated. The positivelead from the supply is through a circuit breaker 200, FIGURE 1, thencethrough a lock-switch 201. From the lock-switch the current isdistributed by conductor 159 to three devices: to motor 50, to relay202, and to transformer 203. The conductors to the motor are to beobserved under caption Reverser. The conductors at the transformer, andat the relay, are to be noted under caption Safety-timer.

A capsule 22, FIGURE 1, is mounted on one side of the jambs of doorwayframe in position to receive headlamp-beam 2 1 from automobile 20. Cell23, within the shell of capsule 22, is any semi-conductor, orsolarbattery, or suitable combination of matter, through which electriccurrent flows in the more volume as the volume of light-rays which reachit may be increased. The design and merits of capsule and cell are asdescribed on pages 8 and 9 of my pending patent application H.

Two conductor-wires 24 and 24 lead the electric current from transformer203 to cell 23, and from cell 23, through safety-switch at 184, to relay202.

Door-drive and shift The door 12, appears at FIGURE 1 in closedposition. The positions of parts in FIGURES 2, 3, 4, 13, and 14, are aswith an open door. Door 12 is of a design used broadly, in severalsections horizontally hinged together, moving from a vertical closedposition upward to a horizontal open position, guided and suppo1ted bytracks that are vertical on each side of the doorway frame, such as 13,and are horizontal overhead inward of the garage, such as 15, and havecurved sections such as 14 joining the vertical tracks to the horizontaltracks.

At or near the hinges which join the horizontal door sections, bracketssuch as 16 carry pins such as 17 which pins extend sideward beyond thedoors left and right edges, and constitute axles for rollers such as 18which run in the tracks, either side of the doorway.

Within the horizontal and curved tracks is a joined linkage of fivelinks, three outer links 25, 27, and 29 of channel-section, embracingtwo narrower inner links 26 and 28 of channel-section; these links beingjoined, outer to inner, pivotally, by pins such as 32. Within slots 26'and 27 (FIGURES 10 and 11) are rollers such as 33, FIGURE 1, which runin the base-grooves of the tracks.

FIGURE 10 shows a flat sheet-metal blank for links 26, 27, 28, and 29,as punched before being bent into channel form. Of the pairs of brokenlines 26" in FIG- URE 10 that parallel slots 26', the inner of each pairindicates the location of bend for narrower links 26 and 28; the outerof each pair indicates the location of bend of the wider links 27 and29. FIGURE 11 shows a flat door-end-blank for a link 25, which connectsto the door at pin 17 in door-bracket 16. This end-blank becomes shearedalong broken lines 25", and the severed flange 25B is brought over tothe opposite flange, the two flanges being riveted together by rivets25D, FIGURE 12, through rivet-holes 25C, reinforced as a double-thicklug, slipped onto pin 17 through which the motor-drive is applied to thedoor. This door-end connection is alternative to the jaws 89 whichappear in FIGURES 8, 9, and 10 of my pending patent application H.

In FIGURES 10 and 11, half circle or quarter-circle notches such as 28',provide for free articulation at pivots 32 whetherthe linkage isinstalled, as shown in FIG- URE 1, in what may be called the right-handtrack of the garage, or is installed upside down in what may be calledthe left-hand track of the garage. The notches admit the webs of linksadjoining.

On pin 35, at the leftward end of the jointed linkage as viewed inFIGURE 1, a detaching-lug 30 is retained by cotter 31, FIGURE 13. Topermit of manual operation of the door, cotter 31 may be drawn byfinger-ring 34 out of pin 35, so that lug 30 may he slipped off.Detaching lug 30 has holes 30', FIGURE 13, through which there isthreaded, and mechanically side-pressed for tight grip, the upper strand40' of cable 40. The cable 40, of upper strand 40 and lower strand 40",runs, similarly to an endlessbelt, around grip-sheave 55 at motor, FIG-URES 1 and 13, and around slated-pulley 45, FIG- URES 1 and 17, whichpulley is mounted on a web 19' between curved track 14 and jamb-bracket19', which bracket is bolted to the door-frame 10.

Mounting of slanted-pulley 45, (alternatively to that shown in mypending patent application -H) appears in FIGURE 17. This mountingaffords an economy in labortime, in that it avoids the need for theinstalling-man to cut a sizeable opening out of the metal of web 19'.The slanted-pulley, by having less slant off-vertical, need not reachthrough the web 19'. The cables lower strand 40" may get to the rearwardside of track 14 through an aperture 48 obtained by driving a chiselbetween the rigid track 14 and the thin Web 19'. To hold the pulleyspint-1e 46 on a lesser slant than appearing in application H, fourpieces of a sheet-metal pad 47 are put two either side of a pintle-holedrilled through web 19.

FIGURES 13 and 14 show mechanism mounted at rear end of horizontal track15, including door-drive motor 50 and motor-shaft 51, grip sheave 55 ofnylon in two parts, a recessed disc 56, and a shouldered disc 57; also,on the threaded end of motor-shaft 51, a grip-spring 54 and two nuts,compression-nut 58 and lock-nut 59.

In a test I made at the laboratory-shop of Berry Door Corporation,Birmingham, Mich., I found that the tenuous strands of wire, that makeup the best cable of stainless steel, broke and stripped from the cable,after about 5000 operations, when the material of the slip-grip sheavefacings (under spring-pressure for frictional contact with the cable)were of metal, or of sintered oil-bearing metal; whereas, usingresilient nylon in contact with the cable, no noticeable wear in thenylon, or failure in the cable, occurred through 25,000 operations,equivalent to 25 years at the average residence-garage.

An improved arrangement is obtained by setting the inverted motor-baserearward of the rear end of track 15, and locating a hanger 60 so thatan edge of it butts against the end of track 15 and is so positioned forconvenience in installation by a cleat 61. Flange 52 of invertedmotor-base is bolted to flange 60 of hanger by bolts 62 and 62'. Theflange 52" of motor-base, frontward of FIG. 13, or appearing in FIGURE15, takes bolts that fasten braces or guy-rods to positions on thegarage-structure.

The cabinet is supported by machine-screws 63 to a lower flange 60" ofhanger, and by machine-screws 63' to an angle-piece 64 screwed at 63" tothe front side of motor gear-box 50'.

Upon hanger 60 shifters 66 and 66 are supported pivotally by respectivestuds 67 and 67; these shifters being interconnected by a trace 65pivotally at respective cottered pivots 68 and 68'.

The ends 65 and 65" of trace, formed at right angles to the main length,have holes which receive loop-ends of respective shift-springs 70 and71. These shift-springs at their respective inward loops 70' and 71'connect to rocker 75 which pivots at 74 to a shoe 76 riveted to hangerat 77, and connects pivotally at 78 to leaf 102 later noted. The end ofrocker at hole 79 connects to leaf 102 when rocker and leaf 102, withthe motor and the shift-mechanism, are transferred to positions belowthe cabinet.

The gradual slant, FIGURE 9, in the reach of strand 40' from detachinglug 30 to slip-grip sheave 55, is less acute the farther the lug 30travels toward the doorway. Notwithstanding, there is a bias throughout,which keeps the jointed-linkage tending toward the vertical side-web 15of the track and away from the tracks open side.

In the designs that appear in my early patent applications the tendencyhas been outward through the open side of the track, and in myapplication H the tendency has been parallel with the track.

The tendency shown here, inward of the track towards the closed verticalside-web of the track, has been made possible by the arrangement inwhich the horizontal center line of motor-shaft may be positioned at, orhigher than, the roller-groove part of the track, and yet be clear ofthe track, by having motor and shift assembly of FIGURES 13 and 14 setrearward of the rear-end of track.

In this design the tendency of the jointed linkage and its rollers 33 isto rise slightly out of contact with the tracks groove, as theupper-strand is pulled by counterclockwise rotation of motor shaft 51and grip-sheave 5'5, due to the slant being upward from the lug-pin 35rearwardly to the groove of grip-sheave 55. Thus the linkage and itsrollers '33 move free of friction with the track.

In my patent application 'H, it will be observed that pull by upperstrand of cable is from a cable-groove in grip-sheave lower than thelug-pin in jointed-linkage, causing the cable to slant oppositely to theslant in this present application, and occasioning pressure and frictiondownward upon the track.

Shipper-button Shipper-button 44, FIGURE 16, on upper strand 40" ofcable 40, and on lower strand 40", FIGURE 1, is of a novel design whichapplies a frictional hold equally on both sides of the cable by nutssubject to tightening by wrenches on an exterior thread, rather than theless effective set-screw tightening into an interiorly threaded hole bya screwdriver having a relatively small blade. This shipper-button isless expensive to make, and of a lesser size, than as shown in my formerpatent applications, as in H, and has a more positive hold on cable thanthat shown in my former designs. In manufacture, a threaded stud 44",FIGURE 16, is drilled across the middle by a drill size suitable to thediameter of the cable; nuts 43' and 43" are put on both ends of thestud; at installation these nuts are tightened against the cable bywrenches to utilize extensive nut-surfaces for gaining an optimum offrictional hold upon the cable.

Auxiliary drive for doubled traction At a garage for two cars, having asingle door of about 16-foot width, in smooth-running condition and wellcounterbalanced, a drive from the one slip-grip sheave 55 is adequate.But not infrequently a door is encountered at which tracks have beendamaged by accident; or at which resistance to hand-operation occurselsewhere at some spots in the door-movement; or at which the door setsitself at an angle, one end slightly higher than the other, setting uproller-friction, and jamb-friction; so that a greater traction bygrip-sheave is needed, uniform at both sides of the doorway.

For such a door, a shaft is provided across the garage from the motor toa grip-sheave mounted at the rear end of the track that is parallel to,and oppositely across from,'track 15 of FIGURE 1.

Motor-shaft 51, of which a cross section appears in FIGURE 13, and athreaded end appears in FIGURE 14, reaches through motors gear-box 50and (indicated 51) out beyond the face-end of gear-box.

In FIGURE 15 a broken-away and fragmentary side view of the face-end ofgear-box 50 appears, and with it the end 51. Socketed and pinned uponend 51' is a cross-shaft 53 which extends across the garage to thedoor-guide track 215, where it is Socketed and pinned to a shaft 217having a diameter corresponding to shaftend 51', and having the sameflat for keying to gripsheave. The grip-sheave is identical with sheave55, being of nylon in two parts, a recessed disc 220, and a shouldereddisc 219, pressed by spring 218 for frictional drive. A cable 210identical with cable 40, (except that it carries no shipper-buttonscorresponding to 44), provides a drive upon the door as with cable 40,similarly to an endless belt running around a slanted pulley (notappearing in FIGURE 15) identical with pulley 45, and mounted in thesame way; and cable 210 carries a detaching-lug connected to ajointed-linkage which attaches to the door in the way shown anddescribed for FIGURE 1. Two brackets 211 and 212 are bolted to track 215and these support the grip-sheave and associated parts. Bracket 211embraces bearing 213 in which the hub of sheave-disc 219 turns; andbracket 212 embraces bearing 214 in which turns the hub of sheave-disc220.

A strip 216 may be fastened to a hanger that, in usual practice,supports track 215 from the garage-ceiling, or it may be fastened to anysuitable spot in the garagestructure.

Cabinet-construction In the construction of the cabinet, an object hasbeen to make the mechanism accessible at three directions of approach,from the front, from the right-hand side, and from the left-hand side.These sides are to be closed by a cover 85. Thus, three sides of thesix-sided cabinet are in housing 81, comprising the top, the rear wall,and the floor. Upon this housing all interior parts are supported, therebeing nothing used mechanically that is fastened to or supported by theinterior surfaces of the cover 85. The housing and the cover are madefrom two pieces of sheet metal of precisely the same dimensions whenfiat, an economy in tooling for forming and otherwise.

At right angles to the end-surfaces of these two sheetmetal piecesnarrow end-flanges" such as 82 and 82" are formed. One of these flanges82' turns vertically downward from the top of the housing and the other82" turns vertically upward from the floor. These have four corner holes83 in which sheet-metal screws hold the front 85 of the cover.Corresponding flanges of the cover 86' and 86", FIGURE 4, embrace theoutside of the rear wall of cabinet. The forming of the cover is done toproduce a slight bias of the side walls inwardly so that the flanges atthe rear will spring over without fastenings. A notch 209, FIGURE 4,punched in the bottom edge of cover, admits stern 206 of push-button205. A feature of the construction is a dust-guard. The end-flanges 82'and 82", FIGURE 3, are punched to afford narrow notches, such as 84,FIGURE 2 upper right, and FIG- URE 4, one at each of the four corners.The breadth of the front 85' of the cover, FIGURE 3, is formed to occupythe notches, and thus to bring the side-walls under the edges 81' of thetop, FIGURES 2 and 4, and above the corresponding edges of the floor;the overhang of these edges narrowing as the side walls reach toward therear wall, on a slight slant appearing in FIGURE 4. This overhang servesto guard against and minimize the entry of dust.

Devices within cabinet A bolster 90 is fastened vertically within thecabinet by rivets 91' and 91" to ceiling and 92' and 92" to floor.

A horizontal midrod 95, reaches from a hole in rear wall of cabinet to ahole in bolster and is confined by cotter-pins 94 and 94, FIGURE 4. Onmidrod 95 an actuator 115 pivots, FIGURE 5. This will be observed underthe caption Actuator.

Leaf 102', FIGURE 2, is connected by cottered pin 78 to rocker 75, andattached by cottered pins 101 and 101' to plate 100. Holes 101 at bottomend of plate 100 are for alternative attachment of leaf 102.

Leaf 102 and plate 100 could be integral in a single strip ofsheet-metal, except for separability needed in turning motor andshift-mechanism upside-down (as if on motor-shaft 51 as an axis,counterclockwise of FIGURE 13): the level of motor-shaft must be closeto the level of track for cable-drive. The Detroiter door made by BerryDoor Corporation at Birmingham, Mich., has tracks at the level of thetop edge of door, needing no garage-headroom. A cabinet put below themotor-level and track-level would reach so low as to be in the way ofpersons heads. So thecabinet may be conveniently set above track-leveland motor. But at doors having a curved track, as in FIGURE 1, withhorizontal track about a foot above level of doorway-lintel, the cabinetis set below the track and motor: push-button 205 readily within reach.

A limb 104, at its integral flange 105, FIGURE 4, is fastened toplate100, by a tight rivet 103', FIGURE 2, and a cottered rivet 103. Limb 104has an ear 106 integral; also a flange 107 integral; rivets 108 throughflange 107 holds a reverser 150 of rubber, observed under the captionReverser.

Cotter pins 193 and 194 have close fits in plate 100 and are cleared bynotch 102' in leaf 102 in both alternative positions of leaf accordingto whether motor is set above or below the cabinet. The heads of thesecotter pins receive eyes 195" and 196" of respective dashsprings 195 and196, observed under the caption Safety timer.

A hitch 99 is pivotally connected between cottered pin 98 on bolster 90,and cottered pin 103 on plate 100. Dimension 98 to 103 corresponds withdimension 74 to 78 of rocker 75.

When cable-strand 40 moves its first fraction of an inch at the start ofa door-closing movement, it takes shipper-button 44, FIGURE 13, awayfrom the upper end of shifter 66, enabling shift-spring 70 to relieveits tension and return to its normal length and to its counterbalancewith shift-spring 71. In this condition shifters 66 and 66,shift-springs 70 and 71, trace 65, and rocker 75, would be under norestraint against a vertical dislodgement of plate 100, and possibledrift of motor-reversing controls and other parts governed by plate 100,as might be induced by gravity upon plate 100, or upon parts attached toit, or as might be induced by vibration during the door-drive, whenrollers holding the weight of door run in the horizontal track-exceptthat a toggle is provided to hold plate 100 positively in its upwardposition when set there, and positively in its lowered position when setthere. The toggle consists of toggle-spring 110, FIG- URES 2 and 4,having its eye 110' at one end engaged into a hole in ear 106 of limb104, and its eye 110" at its other end engaged into the head ofcotter-pin 111 the shank of which, bent at a right-angle, pivots in hole93 in bolster 90.

The level of hole 93 in bolster 90 is half way between the alternatingupper and lower levels of ear 106. The movement of hitch 99 is throughan arc 96 described by 103 from center of 98 in FIGURE 2, the horizontaldisplacement of which are, sidewise from the arcs vertical chord, isabout of an inch, midway. Since are 97 of a radius centered at 93 anddescribed at 106 produces a horizontal displacement roughly half that ofare 96, toggle spring 110, to follow are 96, must stretch, and find itslesser tension at the upper and lower extremes of the up and downmovement. At these extremes spring 110 approaches its normallycontracted length and resists dislodgement upward or downward, and sotends to hold plate and related parts from undue movement out of upperor lower positions into which these may be set.

Actuator Actuator 115, FIGURES 2, 5, and 6, is a round tube 114 ofparallel walls, preferably of relatively light weight material, pivotedon mid-rod 95, closed at its pivoted end, the top end, by a plug 121,and closed at its bottom-end, the end normally the lower, by a plug 123;and having across its interior a web 122 which separates pivotal chambar115 from hammer-chamber 115".

The flowable material which drains by gravity from chamber to chamber isin the form of globules of lead the values in which are about to beobserved.

Web 122 has a drain-notch 122, FIGURES 2, 5, and 6, punched from itsperiphery, through which notch the lead-globules pass.

This notch 122', by location at the periphery of the web, ensures thefull drainage of lead globules from chamber 115" to chamber 115', ofvalue in obtaining maximum differential in force of inertia as between acharged hammer-chamber 115" and an empty chamber. In designs shown in myearlier patents and patent applications, some of the content of flowablematerial was trapped in pockets adjacent to a centered neck unless theactuator-tube could be held in fully vertical position and that positionwas difficul-t to attain, at the up-swing, by a solenoid of pracicalstrength, also, in such a position, jamming of the flowable materialocurred due to the weight of the pack above.

Ordinarily, after the actuating swing-through, the tube 114 recedes bygravity to hang in the almost vertical position appearing in FIGURE 2.In this position, globules that have entered chamber 115 return bygravity to chamber 115".

The longitudinal dimension of pivotal chamber and that of hammer chamberare subject to change according to position of web 122. The optimum ofadvantage in the setting of web 122 is established in a shop-fixture toposition and hold the web by friction.

The frame 131 of a solenoid 130, is held to housing 81 by cottered pin128 and a rivet 129, FIGURE 3. To frame 131 a cap 131' is riveted. Thes0len0id plunger is connected by cotter-pin 126 to a pitman 133, a hole132 of which pitman connects to the top-end metal of actuator, this topend having below it for accessibility of pitman metal, a hole 119,FIGURES 2 and 5. A pull by solenoid-plunger 125 eflected through pitman133 upon actuator 115 raises the actuator to an upper position 116,FIGURE 5, in which lead-globules may drain by gravity from thehammer-chamber 115" into the pivoted chamber 115.

If this raising of the actuator occurs intentionally to obtain anoperation of the door, the energization of the solenoid will be for amomentary period of one or two seconds, so that the actuator will dropwith its charge of lead-globules little depleted, and it will swingdownward and rightward through a distance which, as at 117 of FIGURE 5,will dislodge a hold by an enclosure, described under caption reverser,to close a power circuit to door-drive motor to operate the door. But ifthe elevated position of actuator is held for a sustained period, as byrays of the sun from the horizon, the drainage of leadglobules into thepivoted chamber will deprive the hammer-chamber of force of inertiasufiicient to dislodge the enclosure; thus door-actuation will not beobtained.

This two-chambered device appears first in my patent C. Developmentshave appeared in my patent applications D and H.

The design here shown has improvements as follows:

(I) Economy of manufacture in the use of a tube of parallel sidesthroughout.

(II) Increase in diflerential as between an adequately 9 filledhammer-chamber and an empty hammer-chamber by reason of:

(a) Using a tube of relatively light-weight material.

'(b) Using a flowable material of relatively high specific gravity.

(c) Adjustability in position of web across the tube, to confineflowable material close to pivot 95 once it has been drained intochamber 115 at position 116, the closer the greater the ditferential.

(d) Locating of drain-notch at periphery of web 122 to obtain fulldrainage at angular position 116 short of vertical.

-(e) Adaptability, according to contracted length and wound strength ofspring 166, in resistance at the termination of down-swing by actuator.

(III) Prevent-ion of escape by plunger 125 of solenoid; by theintroduction of a rigid pitman 133 between plunger and actuator,preventing outward movement by plunger beyond a safe nesting within coreof solenoid.

Globules of lead Globules of lead 112, within the actuator tube, are, asnoted, the flowable material that drains from chamber to chamber. Theselead-globules, produced by precipitation of molten lead, during whichthe lead before cooling takes the form of practically perfect spheres,are of a uniform diameter obtained by sifting.

The copper fragments chopped from copper wire, as described in my patentapplication H have irregularities and tenuous threads that, on occasion,bridge across the flow-passageway between chambers of the actuator, soas to impede the flow, adversely affecting dependability.

Advantages of lead-globules within the actuator are:

(a) Dependability of flow inherent in spherical particles.

(b) Absence of oxidation that in some materials arises from presence ofwater-vapor.

(c) Nonadhesion of globules to each other due to dampness.

(d) Absence of need to bake the material to remove dampness.

(e) Absence of need to protect the material in an airtight container.

(f) Nonmagnetization that would cause globules of a material such assteel to adhere in clusters.

(g) High specific gravity among materials of low cost.

(h) Close packing of spherical particles, affording greater mass inrelation to space within a hammer-chamher.

(i) Precision in rate of flow by globules of uniform size.

(j) Susceptibility to precise time-control in a given volume.

Reverse The reverser 150 is made of pure gum rubber, unchanged byingredients such as are useful to provide properties not needed for thepurposes here described. Pure gum rubber will retain its flexibility andresilience through a longer period of years than will rubber containingadmixtures.

Reverser 150 is fastened at one end by rivets 108 to the bottom offlange 107 of limb 104. Its flexibility permits of its acting as ifhaving a hinge to flange 107. Reverser 150 has, passing through its freeend, FIGURES 2, 3, and 7, two electrodes 153 and 154 of silver; theseextend above and below the flat top and bottom surfaces of thereverser-rubber. The dielectric character of rubber permits of itsacting as a shield in connecting an electric wire to each of the twoelectrodes 153 and 154. Pockets, slightly short of the respectiveoutlines of soldering lugs 156 and 157, FIGURE 7, are cut into therubber from each of the opposite sidewise edges near the free end of therubber. The knife in the fixture which makes the cut is controlled as tothe depth of cut by a stop, so that an end of a soldering-lug 156 or 157(having a hole in it through which an electrode 153 and 154 are to pass)must press the rubber to yield beyond the depth of the pocket. Eachelectrode has a groove 153', FIGURE 7, machined around it, into whichsnaps an edge of the hole in lug 156 or 157, as the electrode is putthrough the rubber. The yielding and resilience inherent in the rubbereffects a continuing pressure by lug 156 or 157 against electrode 153 or154, ensuring a firm contact lugto-silver for an adequate flow ofcurrent and locking the electrode against escape from the reverser 150.

Each lug 156 and 157 has an additional hole where the lug projects outfrom the edge of the reverser-rubber; this hole takes the electric wirefor the soldering operation. Conductor-wires 160 and 161, soldered torespective lugs 156 and 157 are highly flexible to apply a minimum ofrestraint to free movement of reverser-rubber in the inherent tendencyof the rubber to straighten. Conductorwire 160 is one of the controlwires from the motor, FIGURE 1. The other conductor-wire 161, solderedto lug 157 leads directly to the neutral side of the supplyline,FIGURE 1. Conductor wires 160 and 161 come to the reverser-rubber wherethe rubber is attached to flange 107 of limb 104. Here they are strappedby friction-tape put around rubber and flange as these wires turn at anangle to lie along respective edges of the rubber.

Electrodes 153 and 154 are arranged for making electrical contacts withrespective electrodes and 135, above them, FIGURE 7, and for makingalternative electrical contacts with respective electrodes 136 and 136'below them. Electrodes 135 and 135' of silver, have respectivecontact-heads downward and have respective shanks upward through theupper flange of a holder 137, and through respective soldering lugs 139and 139'; each silver shank being riveted (upset) to hold its respectivelug 139 or 139. Conversely, contact-heads of electrodes 136 and 136' areupward for contact with respective elec trodes 153 and 154, and theirshanks, together with soldering lugs and 140', are downward through thelower flange of holder 137. Each electrode 135, 135', 136-, 136' isinsulated from holder 137 by a plastic sleeve around its shank, and bymica washers under the contact-head, and between holder 137 and itsrespective soldering lug 139, 139, 140, or 140'. Holder 137 is supportedby bracket 142, riveted to floor of cabinet. Holder 137 and wiring andsoldering-lug connections are insulated from bracket 142 by a fibersheet 141 and by nylon rivets 138 (set up under heat) as appearing inFIGURE 8.

To the lug 139, FIGURE 7, at upper right of holder 137, there issoldered a conductor 143 from motor which, for convenience, may beregarded as having a polarity to effect a rotation of motor-shaft 51 andsheave-wheel 55 counterclockwise as viewed in FIGURE 1 to open the door.To this same lug 139 a conductor 145 is soldered, running to the lug140' at lower left of the enclosure.

Conversely there is soldered to the lug 139 at upper left of holder 137,FIGURE 7, a conductor 144 from motor, regarded as having a polarity toeffect a clockwise rotation of motor to close the door. To the same lug139' a conductor 146 is soldered, running to the lug 140 at lower rightof the enclosure.

A trapeze 147, pivotally depending from cottered pins 128 and 127 at theupper ridges of solenoid frame 131 and of solenoid-cap 131' respectively(cottered pin 128 extending to carry the trapeze), has a clevis 148riveted to trapeze, clevis 148 forming upper and side boundaries of anenclosure, and having two bottom end flanges, one at each side, by whichit is riveted to a fiber strip 149 forming the lower boundary of theenclosure.

An extension spring 166, FIGURES 2 and 4, attached to the trapeze in ahole 167, passes through a freewayhole 168 in solenoid-cap 131', andattaches to bolster 90 at hole 89. Spring 166 applies a pull to keep theclevisenclosure tending leftward of FIGURE 2 against stop 169.

Pressed through holes in the rubber of reverser 150 and cemented to therubber after adjustment, are two arrestors 162 and 163, FIGURES 2 and 4,in the form of billets cut from round rod of any suitable material. Thelower reach by these arrestors is greater than the upper: fiber strip149, upon which the arrestors lodge as the downward movement of reverserapproaches its low position, is set low enough to swing under the wireconnections of soldering lugs 140 and 140'.

Being firmly held to flange 107 of limb 104, the reverser 150 movesupward and downward with the limb. As viewed in FIGURE 2, the reverser150 in its downward travel towards the end of the door-opening movement,has brought arrestors 162 and 163 to rest on fiberstrip 149. At thisposition arrestors 162 and 163 prevent electrodes 153 and 154 frommaking contacts with electrodes 136 and 136. The door will not be againdriven by motor while this hold of reverser by arrestors continues. Whenthe actuator as in FIGURE reaches clevis 148 (rightward side of clevisenclosure FIGURE 3) with :force of inertia required to-move thefiber-strip 149 out from under arrestors 162 and 163, the reverser 150will straighten further to bring the electrodes 153 and 154 into contactwith electrodes 136 and 136 and set the motor into rotation clockwise ofthe view in FIGURES l and 13 to close the door.

As the door approaches closed position, the circuit in the supply ofenergy to the motor is broken in the lifting of reversers contact-points153 and 154 away from contacts 136 and 136' on holder 137. This break ofthe motorcircuit stops the motor. As noted under Operation, the doorcoasts to closed position, and lifts leaf 105, trunk 100, limb 104, andreverser 150, bringing reverser upward until its arrestors 162 and 163come to rest against the upper horizontal part of clevis 148. There thereverser remains, poised to almost straighten itself in bringing itselectrodes 153 and 154 into contact with electrodes 135 and 135', ofpolarity counter to that of the electrodes from which it has beenwithdrawn, so that when such contact occurs the rotation of motor willbe in counter-clockwise direction, as viewed in FIGURES l and 13, toopen the door.

It is to be noted, FIGURE 2, that the squared ends of arrestors 162 and163 slant with the reverser-rubber to which they are attached. Theseslants, at both upward and downward positions of the reverser, are suchthat when fiber-strip 149, or clevis 148 of the enclosure, is movedrightward of FIGURE 2 the slants ease the move rather than impede it.This contributes to one object of the invention, to provide thatdisengagement of the enclosure will respond to a gentle impulse by theactuator.

The values of rubber, or of plastic or other material having similarproperties, in a device for reversing the rotation of a motor, may besummarized:

(I) Of the two electrodes carried by the rubber, each is indepedent ofthe other to the extent that, after one of the electrodes has made itscontact with the electrode facing it, the other electrode is, in theinherent urge 2f the rubber to straighten, continued in movement to meetthe electrode facing it, in order to complete the closing of thecircuit.

If the electrodes were carried by a rigid member, having perhaps a hingeat the position of flange 107, the rigidity could prevent the closing ofthe circuit by one of the electrodes after the other had closed, unlessthe device were made with precision. Precision is both expensive andvulnerable. The slightest inaccuracy, or looseness in construction,could prevent the closing of the circuit.

(11) Rubber being itself a dielectric, insulating is saved in a numberof places.

(III) Rubber may be positioned and held, short of its normalstraightened condition, and, when released, will itself make a furthermove without need of extraneous devices such as cams or springs.

Safety-timer A means for breaking the circuit of which the cell 23 is apart, meets conditions such as might cause a premature closing of anopened door which could occur when an automobile was passing through thedoorway; or might cause a premature opening of a closed door which couldoccur when an automobile having left the garage, and having closed thedoor by its headlamp beam, was maneuvering in the driveway. The driverof the automobile, returning to the garage in darkness would, inapproaching the door, bring the headlamp-beam to bear upon the capsule,and then extinguish the beam. This would cause the door to open. Uponthe door having opened, the driver could light the headlamp-beam andsteer the automobile towards the doorway, thus withdrawing theheadlamp-beam from the capsule at doorway-frame. These two actions bythe driver, (1) reapplylng the headlampbeam at the capsule, (2)withdrawing the beam, would set the door into its next movementto close,while the automobile was passing through the doorway.

A break, for safety, in the circuit of which the cell is a part, to lastfor a period of time after each opening or closing of the door, isprovided by a safety-timing switch between contact 184, FIGURES l and 2,and contacts 187 and 188 about to be observed.

A cylinder closed at one end, as at 175, and open at its other end toadmit a solid plunger 176, is used as a timing-device in which escape orintake of air occurs along a scan passageway, a space, less than athousandth of an inch, that lies between the interior of the cylinderwalls and the exterior of the plunger body. The cylinder and plunger areof glass ground to this close fit, unlubricated since lubrication mayharden in cold weather, but, in delicate timing-work, capable of 50,000operation, equivalent to 50 years wear at the average residencegarage.The cylinder is protected by a sleeve 177 of soft foam-rubber, intowhich it is cemented; and the sleeve 177 is cemented at 178 to theceiling of the cabinet. The soft rubber, in its flexibility, permitscylinder 175 to swing in any direction, avoiding the provision offurther pivotal means. A neck 176 on the lower end of plunger 176provides for attachment of a flexible rubber tongue 179 which, with afiller 181, is held by cottered-pin 182 to the end of a channel-shapedarm of sheet-metal, pivoted on solenoid cap 131' by a cottered rivet183. Rubber tongue 179 transmits a flexible drive movement to plunger176.

On arm 180 is a contact-point 184 of silver, and a soldering lug 185,these being insulated electrically from the arm 180 by a plastic sleevearound the contacts stern, and, by mica washers 186 and 186respectively, put under the contacts head, and put between the metal ofarm 180 and of lug before upsetting stem to hold lug 185. Two silvercontact-points 187 and 188, and respective soldering lugs 189 and 189,are similarly insulated from and mounted upon bolster 90, these twobeing connected by an insulated jumper-wire 191, so that either ofthese, upon coming into contact with the contactpoint 184 on arm 180,will have the same effect, closing the circuit from cell 23 to relay 202through conductor 190 soldered to lug 185, and through conductor 192 onlug 189'.

Through holes 180' and 180" in arm 180 there extend looped ends and 196'of two springs 195 and 196, normally counterbalanced, and the eyes 195"and 196" of these engage in heads of respective cotter-pins 193 and 194,attached to plate 100. Springs 195 and 196 contract to normal after aperiod of time following the upward movement of plate 100 at terminationof doors movement in closing, and after a period of time following thedownward movement of plate at termination of doors movement in opening;they remain in counter-balance thereafter to hold silver contact point184 in contact with one or other of silver contact points 187 and 188 onbolster 90.

When plate 100 rises by, say, an inch, the upper spring 195 stretches,while the lower spring 196, rising the same inch with plate 100, slipson its loop 196' into the channel of arm 180. Toward the end of theinch-rise of plate 100, the stretch of the upper spring 195 is liftingarm 180 somewhat (against lightly compressed air in cylinder 175), sothe loop of lower spring 196 does not need to be a full inch in length.As compression of air in cylinder becomes greater, so that arm 180 andplunger 176 move the more slowly under pull by upper spring 195, theloop in lower spring 196 approaches more and more to a position parallelwith an arm 180, not finding the relatively narrow channel within arm180 a restriction.

Holes 180' and 180" are at diflfering distances from pivot 183. Upperspring 195 is opposed by gravity in lifting arm 180 and plunger 176; thelower spring 196 is helped by the weight of arm and plunger. So theupper spring 195 is given a longer leverage, farther from pivot 183. Thelower spring 196, under-favored by length of leverage, moves arm 180 themore slowly, giving a longer safety time-period. A longer time-period isthe more valuable when door is open, and when another car, followingbehind in the driveway, could bring the door down upon the owners car asit should be passing through the doorway. A premature closing of doorcan be of more concern than a premature re-opening.

Push-buttons A push-button 11 on door-frame 10, or a lock in place ofit, closes the circuit of conductor 24 from transformer 203 to cell 23,and of conductor 24' from cell 23 to relay 202, to obtain the sameresult as noted under Operation for the application of the headlamp-beamto cell 23.

A push-button 205 at cabinet 80, FIGURES 3 and 4, has its stem 206engaged into a hole in lever 207, this lever 207 being pivoted on a stud208 held in housing 81. Finger-pressure on the button leftward ofFIGURES 2 and 4 causes lever 207 to move trapeze 147, clevis 148, andfiber-strip 149, rightward of FIGURE 2 and so to dislodge fiber-strip149 to free the reverser to bring its electrodes 153 and 154, in thedirection in which the reverser rubber is biased at the time, intocontact with respective electrodes 136 and 136' to close the door, orinto contact with respective electrodes 135 and 135' to open the door.

Operation In FIGURES 2, 3, and 4 the several parts of the dooroperatorare in positions as when the door is open. When headlamp-beam is broughtto bear upon cell 23 in capsule 22 at doorway-jamb 10, passage ofcurrent through the cell from secondary winding of transformer 203increases to such extent as to energize the coil of relay 202 to closethe secondary circuit of house-current at relay 202, and bring housecurrent to solenoid 130, energizing the solenoid coil to drawsolenoid-plunger 125, and pitman 133 with it, rightward of FIGURES 1 and2, elevating actuator 115 to position 116, FIGURE 5. In this positionlead-globules begin to drain from elevated hammerchamber 115" throughnotch 122' in web 122 into pivoted chamber 115. But if the headlamp-beamis extinguished or withdrawn promptly, as within a second or two, thedrainage is arrested by the de-energization of the corewinding at relay202 and at solenoid 130, freeing plunger 125 to slide outward of thesolenoid core and permit a downward swing of actuator.

But if the elevation of actuator to position 116 has been caused by raysof the sun reaching the cell 23 horizontally as in morning or evening,the application of light will be for a period longer than a second ortwo, suflicient to drain the lead-globules from the hammer-chamber 115"and to deprive the hammer-chamber of force of inertia sufilcient toactuate the door in the course next to be observed.

The downward-swinging actuator, having its hammerchamber charged withlead-globules, has a force of inertia under gravity and motion thatbrings it through to position 117, FIGURE 5, where, against resistanceby spring 166, it has made contact with clevis 148, and dislodgedfiber-strip 149 to escape from its support of reverser 150 at arrestors162 and 163, enabling reverserubber to straighten of its inherent biasinto a lesser bend and far enough to bring electrodes 153 and 154 bothinto contact with respective electrodes 136 and 136', thus closing thecircuits from and to motor to cause motor 50 and grip sheave 55 torotate clockwise and close the door.

As the door approaches within about an inch and threequarters of closedposition, button 44 on strand 40" comes into contact with the lower endof shifter 66, and moves shifter 66, from its position appearing inFIGURE 13, leftward of FIGURE 13, and into its position appearing inFIGURE 1, taking with it trace 65 and shift-springs 70 and 71. Spring 71pulls rocker 75 to lift leaf 102, plate 100, and limb 104, and with themreverser 150, causing reverser to lift electrodes 153 and 154 away fromelectrodes 136 and 136, and to carry arrestors 162 and 163 clear offiber-strip 149, thus opening the circuit to motor 50, stopping themotor, and permitting spring 166 to retract trapeze 147, clevis 148, andfiber-strip 149, leftward of FIGURE 2 into vertical against stop 169.The door coasts under its momentum into fully closed position,stretching shift-spring 71, and causing it to complete the lift of plate100, and to bring arrestors 162 and 163 to bear under the horizontal topof clevis 148, thus holding reverser electrodes 153 and 154 poised tomake contact with respective electrodes and 135' when, at the time forreopening door, actuator swings again to downward position 117, anddislodges clevis 148 from arrestors 162 and 163, freeing reverser tomake the upward contact against electrodes 135 and 135', forcounterclockwise rotation of motor, to open the door.

Operation of accessory elements has been set forth concurrently with thedescription of these.

What is claimed is:

1. In a door-operator, a motor for driving the door, a circuit to themotor, a switch in the circuit, said switch including a tongue ofpliable material having a shape inherently fixed for return into suchshape when freed after bending, two electrodes within said circuitextending through said tongue for making electrical contacts in twoalternative directions, means for bending said tongue, means for holdingsaid tongue as bent, and means for releasing said holding means.

2. The combination of claim 1 in which said tongue is of gum rubber.

3. The combination of claim 1 in which said electrodes are located atopposite edges of said tongue and in which each electrode has a grooveembraced by a soldering lug said lug being in a pocket between thesurfaces of the tongue cut in from the adjacent edge of said tongue.

4. The combination of claim 3 in which an end of each soldering lug ispressed beyond the depth of said pocket against resilience in thematerial of the tongue for setting up a continuing pressure by solderinglug against its respective electrode for ensuring a firm contactlug-toelectrode for proper flow of current, and for fastening saidelectrode by said groove against escape of said electrode from saidtongue.

5. The combination of claim 1 in which said holding means includesprotuberances in the body of said tongue, and an interceptor forengaging said protuberances and for arresting tongue and electrodesshort of closing said circuit.

6. The combination of claim 5 in which said interceptor includesboundary pieces for limiting the course of said tongue towards closingof said circuit in its inherent urge to regain its normal shape.

7 The combination of claim 6 in which said interceptor is spring-biasedfor bringing said boundary pieces into position for reeifectiveness ofsaid holding means.

8. The combination of claim 7 with obstructions on said protuberancesfor preventing untimely reeflectiveness of said holding-means.

9. The combination of claim 5 in which said holding means includesbillets through said tongue for arresting movement of said tongue incircuit closing direction, the ends of said billets being flat, at rightangles to their main lengths, these end-flats lying at an angle oifhorizontal corresponding substantially with the angle of said bend insaid tongue, for easing a circuit-closing dislodgment of saidinterceptor, said interceptor being remotely pivoted to keep itsboundary pieces substantially horizontal.

10. The combination of claim 3 with a stationary arrangement of fourelectrodes, a first pair above, and a second pair below, the range ofmovement of said tongue, a positioning of said pairs to register withrespective electrodes carried by said tongue, for making positivecontacts while holding said tongue in a bend in which said tonguecontinues to exert its urge to reach its said inherently fixed shape.

11. The combination of claim 10 in which said electrodes carried by saidtongue are widely separated for providing that when one of saidelectrodes on said tongue makes contact with a stationary electrode, thesaid urge, continuing in the material of the tongue, will press thetongues opposite electrode into contact with its respective stationaryelectrode.

12. In a door-operator, a reversible motor, a circuit to the motor, areversing switch in the circuit, said switch including a reciprocallytraveling tongue of pliable material carrying two electrodes within saidcircuit, said tongue being inherently biased towards pressing saidelectrodes into a closing of said circuit, an interceptor for deflectingsaid tongue short of closing said circuit, holding means for holdingsaid tongue in its deflected state, and dislodging means for dislodgingsaid holding means.

13. In a door-operator, a reversible electric motor for driving the dooropen "and closed, a circuit to the motor, a reversing switch within thecircuit, said switch including an element biased to a given shapecarrying two electrodes, a structure with complementary electrodespositioned for registering with said electrodes carried by said element,and means for bringing said element-carried electrodes into contact withsaid complementary electrodes in a given order for admitting ofcurrent-flow in one direction to drive the motor to open the door, andfor bringing said element-carried electrodes into contact with saidcomplementary electrodes in an opposite order for admitting ofcurrent-flow in an opposite direction to drive the motor to close thedoor.

14. In a door-operator, a door-drive motor, a circuit to said motor, anda switch in said circuit, said switch comprising a bracket supportingtwo pairs of stationary electrodes within said circuit, an upper pairand a lower pair, a tongue movable between said pairs and bearing twoelectrodes within said circuit positioned on said tongue to registerinto contact alternatively with said upper pair and said lower pair; anarrangement of electrical conductors in said circuit to said electrodesfor producing at said motor a clockwise rotation to close the door whenthe tongue-borne electrodes make contact with said upper pair ofstationary electrodes, and for producing at the motor acounter-clockwise rotation to open the door when the tongue-borneelectrodes make contact with said lower pair of stationary electrodes;and a plate having connections to said door and controlled by movementsof said door, to which plate said tongue is fastened.

15. The combination of claim 14 with a biasing means for biasing saidplate to hold said tongue-borne electrodes in contact with said upperpair after said contact is made, and to hold said tongue-borneelectrodes in contact with said lower pair after said contact is made,said biasing means comprising a rigid member pivoted at one end on saidplate and pivoted at the other end to a stationary bolster, and atoggle-spring arrangement on a longer radius pivoted between astationary position at one end and at the other end to an car on anattachment to said plate.

References Cited UNITED STATES PATENTS 2,658,967 11/1953 MatschkeZOO-61.41 2,758,836 8/1956 Purdy 26859 2,882,045 4/1959 Moore 200 153.l2XR 2,920,151 1/1960 Lawick 200-l53.l3 XR ROBERT K. SCHAEFER, PrimaryExaminer.

H. BURKS, Assistant Examiner.

